SecureAccess 2.0 error please help!

When I am copying files to a SecureAccess 2.0 vault on my 128GB Extreme, it goes along fine for a bit and then I get a popup error which says: Cannot open file for write F:\SandiskSecureAccess Vault\{.....}.dat Error:The directory or file cannot be created. When I click OK, the copy process stops and it ends. I have tried reinstalling SecureAccess 2.0 after deleting everything. I have formatted the flash drive as FAT32 and reinstalled SecureAccess but none of this has helped. Any ideas? Thanks.